3+x-9=15

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Solution for 3+x-9=15 equation: 


Simplifying
3 + x + -9 = 15

Reorder the terms:
3 + -9 + x = 15

Combine like terms: 3 + -9 = -6
-6 + x = 15

Solving
-6 + x = 15

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '6' to each side of the equation.
-6 + 6 + x = 15 + 6

Combine like terms: -6 + 6 = 0
0 + x = 15 + 6
x = 15 + 6

Combine like terms: 15 + 6 = 21
x = 21

Simplifying
x = 21

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